PROBLEM SET 10 - ELECTROCHEMISTRY Redox reactions A redox...

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MSE 110 - University of Arizona Redox reactions ELECTROCHEMISTRY 2 Fe + 3 / 2 O 2 Æ Fe 2 O 3 A redox reactions involves the transfer of electron from the reductant to the oxidant . An oxidation and a reduction must happen simultaneously. Fe Æ Fe 3+ + 3 e - O 2 + 4e - Æ 2 O 2- oxidation Reduction Cu 2+ + Zn Æ Zn 2+ + Cu Cu 2+ + 2 e - Æ Cu Zn Æ Zn 2+ + 2 e - + + +
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MSE 110 - University of Arizona Redox Knowledge Block An oxidation correspond to a loss of electrons Fe Æ Fe 3+ + 3 e - A reduction correspond to a gain of electrons O 2 + 4e - Æ 2 O 2- The standard redox potential E o quantifies the relative ability of each redox couple to give or take electrons. High E o : strong oxidant. Low E o : strong reductant In an electrochemical cell , the potential difference (voltage) between the two electrodes is Δ E o =E o Ox -E o Red . E o Ox is the standard potential of the oxidant E o Red is the standard potential of the reductant A reaction takes place only if E o Ox >E o Red and therefore Δ E o >0 Δ E o is a measure of the driving force of the reaction and is related to Δ G according to Δ G = -nF Δ E o .
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MSE 110 - University of Arizona Problem 1 which of the following redox couple is the strongest reductant?
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